Platanaster

Platanaster ('plate star') is an extinct genus of sea stars.

Taxonomy
†Palasteriscidae
 * †Urasterellinae
 * †Cnemidactis
 * †C. girvanensis
 * †Urasterella
 * †U. asperrimus
 * †Palasteriscinae
 * †Lanthanaster
 * †L. cruciformis
 * †Platanaster
 * †P. ordovicus
 * †Baliactis
 * †B. ordovicus